Sesshin

A sesshin (接心, or also 摂心/攝心 literally "touching the heart-mind") is a period of intensive meditation (zazen) in a Zen monastery.

While the daily routine in the monastery requires the monks to meditate several hours a day, during a sesshin they devote themselves almost exclusively to zazen practice. The numerous 30- to 50-minute-long meditation periods are interleaved with short rest breaks, meals, and sometimes short periods of work (Japanese: 作務 samu) all performed with the same mindfulness; nightly sleep is kept to a minimum, at six hours or fewer. During the sesshin period, the meditation practice is occasionally interrupted by the master giving public talks (teisho) and individual direction in private meetings (which may be called dokusan, daisan, or sanzen) with a Zen Master.